#include<bits/stdc++.h>

using namespace std;
using ll = long long;
#define endl '\n'

template<typename T=int>
inline T read() {
    T x;
    cin >> x;
    return x;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n = read();
    vector<pair<int, int>> a(n);
    for (auto &e:a) {
        cin >> e.first >> e.second;
    }
    sort(a.begin(), a.end());
    for (auto e:a) {
        cout << e.first << " " << e.second << endl;
    }
    return 0;
}
